Bhaiya,
Well, if I am not wrong, most of us from Bangladeshi applicant has not int'l credit card or we don't have any close relative stay outside of the country who is bother to make this kind of payment. I don't know about others but from me, even I have relative but I will not bother to them to make for me, because I want to make it happened by myself without any help from others.... ;D ;D, this is only my personal issue....only for my family....
The reason I mention "Safe" is not from CIC point of view. I mentioned it if anyone wants to make this payment through online by third party credit card (known but not sure). Also I assume that our local dual currency credit card has many complications for this kind of payment from respective bank if there is some forex act violation.
In that point I assume all Bangladeshi has limited option through credit card payment compare to Bank DD where always even though from SGVO mentioned in their email/website based on I mentioned it "Safe".
Yes CIC has given those options from Bangladeshi applicant, who can pay online but I am sure this option not for free for any Bangladeshi national who wants to pay by their own credit card from home country like other country, because everyone knows that it is not easy to make payment from Bangladesh credit card for this kind of payment. All though if anyone wants to make payment from their dual currency credit card then the credited amount has been blocked from his/her annual TQ limit and need to endorse in passport which is not wise decision for future fund carry to CA.
I hope my "Safe" explanation is not for debate on CC vs DD.